Your student records the regrowth of sea star arms over three to four weeks using this structured lab sheet for grades 5-8. The sheet opens with the guiding question of whether sea stars can regrow missing parts, then walks through materials, a cutting procedure, and a five-stage visual timeline showing changes from Day 0 right through Week 4 when arms continue to grow. The observation section asks students to track whether new arms appear, whether the central disc heals, how long regrowth takes, and whether all pieces regenerate equally, pushing beyond simple yes-or-no results.

The sea star regeneration lab sheet fits naturally into a marine biology unit study or a broader life science sequence covering animal adaptations and tissue repair. A data table with columns for piece description, observations, and sketch or photo number keeps daily records organized across the full observation window. The conclusion section asks two written responses, one about what the student observed and one about what the experiment reveals about sea stars, giving you a simple assessment checkpoint without writing a separate prompt.